Hello. I have a PhD degree and my thesis was exactly in the field of SAR. I have more than 20 publications in image processing related with SAR technique. You can found me in google, researchgate, etc. I can help you with this project, but budget $400 is too low.
I know everything about SAR raw data simulation, generation, focusing, range-migration, time and frequency domain processing, autofocusing and many more.
Please let me know your ideas.
Thanks.